SIMPLIFIED CONTROL METHOD FOR A THREE-PHASE AC-DC CONVERTER

摘要

The invention relates to a method for controlling a converter of an n-phase AC input voltage into a DC output voltage, each phase of the AC input voltage being connected to a switch (1, 2, 3 ) of the converter, the method comprising the following steps: - (a) A step of determining the signs of j characteristic voltages (Va, Vb, Vc, Va-Vb, Vb-Vc, Va-Vc, Va + 20 °, Vb + 20 °, Vc + 20 °, Va-20 °, Vb-20 °, Vc-20 °); (b) a step of determining a reference combination (C1-C12, C1-C18), to which correspond the signs of the characteristic voltages (Va, Vb, Vc, Va-Vb, Vb-Vc, Va- Vc, Va + 20 °, Vb + 20 °, Vc + 20 °, Va-20 °, Vb-20 °, Vc-20 °) by comparing the signs of these characteristic voltages with the data of a reference table. ; (c) A step of opening each switch during a predetermined opening time (t1, t2, t3) as a function of the reference combination (C1-C12, C1-C18) identified during step (b) ).